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    • 10. 发明申请
    • DEGRADATION OF EXPANDABLE POLYMER BEAD PRODUCTS
    • 可膨胀聚合物珠粒产品的降解
    • US20020049259A1
    • 2002-04-25
    • US09866208
    • 2001-05-25
    • Algis P. AugustCasey P. August
    • C08J009/24
    • C08J9/224C08J9/22C08J2325/06Y10S521/916
    • From an environmental viewpoint, it is desireable to cause degradation of expanded EPS beads and foam cups and other products formed from expanded EPS beads, which are composed of polystyrene and a blowing agent such as pentane. For this purpose, the present invention utlizes the pre-expansion step as an opportunity to initiate foam product degradation by treating the expandable polymer beads during their pre-expansion. The objective of this degradation treatment is to initiate degradation of at least the surfaces of individual beads during their pre-expansion and before they are molded into the final foam articles. For this purpose, a number of degradation treatment options are disclosed for application during bead pre-expansion, including heating the beads by circulation with heated air, admixture of the beads with ozone, aromatic ketones such as acetophenone and benzophenone, and metallic salts, as well as irradiation of the expanding beads with uv radiation (e.g of a wavelength of about 260 nanometers). As a result of the interposed degradation treatment, the foam products degrade first into individual beads, and subsequently into polymeric dust, at a rate that depends upon the intensity of the degradation treatment that is selected.
    • 从环境的观点来看,期望使由聚苯乙烯和发泡剂如戊烷构成的膨胀EPS珠粒形成的膨胀EPS珠粒和泡沫杯等产品的降解。 为此,本发明将预膨胀步骤用作通过在其预膨胀期间处理可膨胀聚合物珠来引发泡沫产品降解的机会。 这种降解处理的目标是在其预膨胀期间和在它们被模制成最终泡沫制品之前至少引发单个珠粒的表面的降解。 为此目的,公开了许多降解处理选择,用于珠粒预膨胀期间的应用,包括通过循环加热空气,珠与臭氧的混合,芳族酮如苯乙酮和二苯甲酮的加成珠和金属盐,作为 以及用紫外辐射(例如波长约260纳米)照射膨胀的珠子。 作为介入的降解处理的结果,泡沫产品首先以取决于所选择的降解处理的强度的速率降解成单个珠粒,随后降解成聚合物粉末。